Declension table of ?kṛṣṇya

Neuter	Singular	Dual	Plural
Nominative	kṛṣṇyam	kṛṣṇye	kṛṣṇyāni
Vocative	kṛṣṇya	kṛṣṇye	kṛṣṇyāni
Accusative	kṛṣṇyam	kṛṣṇye	kṛṣṇyāni
Instrumental	kṛṣṇyena	kṛṣṇyābhyām	kṛṣṇyaiḥ
Dative	kṛṣṇyāya	kṛṣṇyābhyām	kṛṣṇyebhyaḥ
Ablative	kṛṣṇyāt	kṛṣṇyābhyām	kṛṣṇyebhyaḥ
Genitive	kṛṣṇyasya	kṛṣṇyayoḥ	kṛṣṇyānām
Locative	kṛṣṇye	kṛṣṇyayoḥ	kṛṣṇyeṣu

Compound kṛṣṇya -

Adverb -kṛṣṇyam -kṛṣṇyāt